Dell OptiPlex GX1 - Expansion Cards; Expansion-Card Cage; Riser Board

Removing and Replacing Parts on the Mini Tower Chassis 6-17
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The computer has a removable expansion-card cage. The expansion-card cage
contains the riser board and any installed expansion cards. Dell recommends
that you remove the expansion-card cage first before removing or installing
expansion cards.
If you are not removing any expansion cards, leave the external cables
attached to them.
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To remove the expansion-card cage, follow these steps:
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To replace the expansion-card cage, align the tabs on the left and right sides of
the expansion-card cage with the slots on the back and bottom of the chassis.
With the securing lever in its extended position, slide the expansion-card cage
into place.
lever
expansion-card cage
chassis
bottom slot